Word Problem Bank with worksheets - variety of problems

http://mathlearnnc.sharpschool.com/UserFiles/Servers/Server_4507209/File/Problem%20Solving%20Decks%20%28K-8%29/Problem%20Solving%20Deck%20B%20Student%20Sheets.pdf

Check for Understanding - a bank of motivating and fun ideas to check what students know

http://learningisgrowing.wordpress.com/2012/03/20/check_for_understanding/

Estimating with Decimals - a very helpful resource with problems and strategies for multiplication

http://www.mathgoodies.com/lessons/decimals_part2/estimate_products.html

Estimating with Decimals - a very helpful resource with problems and strategies for division

http://www.mathgoodies.com/lessons/decimals_part2/estimate_quotients.html

Reading large numbers - this site allows you to put in any number; have a student or students say the number and then it will check using the written words. The sky is the limit for how the large the number can be. Should be fun.

http://www.mathcats.com/explore/reallybignumbers.html